/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.inputmethod.latin.personalization;

import android.accounts.Account;
import android.accounts.AccountManager;
import android.content.Context;
import android.util.Patterns;

import java.util.ArrayList;
import java.util.List;
import java.util.Locale;

public class AccountUtils {
    private AccountUtils() {
        // This utility class is not publicly instantiable.
    }

    private static Account[] getAccounts(final Context context) {
        return AccountManager.get(context).getAccounts();
    }

    public static List<String> getDeviceAccountsEmailAddresses(final Context context) {
        final ArrayList<String> retval = new ArrayList<>();
        for (final Account account : getAccounts(context)) {
            final String name = account.name;
            if (Patterns.EMAIL_ADDRESS.matcher(name).matches()) {
                retval.add(name);
                retval.add(name.split("@")[0]);
            }
        }
        return retval;
    }

    /**
     * Get all device accounts having specified domain name.
     * @param context application context
     * @param domain domain name used for filtering
     * @return List of account names that contain the specified domain name
     */
    public static List<String> getDeviceAccountsWithDomain(
            final Context context, final String domain) {
        final ArrayList<String> retval = new ArrayList<>();
        final String atDomain = "@" + domain.toLowerCase(Locale.ROOT);
        for (final Account account : getAccounts(context)) {
            if (account.name.toLowerCase(Locale.ROOT).endsWith(atDomain)) {
                retval.add(account.name);
            }
        }
        return retval;
    }
}
